High density (η > 0.7) means high stress → leave solid, no pocket. Only low-density regions get lightweighted. Scenario comparison with s_min=30, s_max=70: - Baseline uniform (w=0.5): 78 pockets, 2886g - Bottom-right heavy: 41 pockets, 3516g (bottom stays solid) - Left-side mount: 27 pockets, 3799g (left stays solid) - Center pressure: 15 pockets, 4295g (center stays solid)